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Input-variable sensitivity assessment for sediment transport relations

Fernández, Roberto; Garcia, Marcelo H.

Authors

Marcelo H. Garcia



Abstract

A methodology to assess input‐variable sensitivity for sediment transport relations is presented. The Mean Value First Order Second Moment Method (MVFOSM) is applied to two bed load transport equations showing that it may be used to rank all input variables in terms of how their specific variance affects the overall variance of the sediment transport estimation. In sites where data are scarce or nonexistent, the results obtained may be used to (i) determine what variables would have the largest impact when estimating sediment loads in the absence of field observations and (ii) design field campaigns to specifically measure those variables for which a given transport equation is most sensitive; in sites where data are readily available, the results would allow quantifying the effect that the variance associated with each input variable has on the variance of the sediment transport estimates. An application of the method to two transport relations using data from a tropical mountain river in Costa Rica is implemented to exemplify the potential of the method in places where input data are limited. Results are compared against Monte Carlo simulations to assess the reliability of the method and validate its results. For both of the sediment transport relations used in the sensitivity analysis, accurate knowledge of sediment size was found to have more impact on sediment transport predictions than precise knowledge of other input variables such as channel slope and flow discharge.

Journal Article Type Article
Publication Date 2017-09
Journal Water Resources Research
Print ISSN 0043-1397
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 53
Issue 9
Pages 8105-8119
APA6 Citation Fernández, R., & Garcia, M. H. (2017). Input-variable sensitivity assessment for sediment transport relations. Water Resources Research, 53(9), 8105-8119. https://doi.org/10.1002/2016wr020249
DOI https://doi.org/10.1002/2016wr020249
Keywords Input variable; Sensitivity; Sediment transport
Publisher URL https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016WR020249

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© 2017. American Geophysical Union. All Rights Reserved.





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